How hard are verifiable delay functions?
Abstract
Verifiable delay functions (VDF) are functions that take a specified number of sequential steps to be evaluated but can be verified efficiently. In this paper, we introduce a new complexity class that contains all the VDFs. We show that this new class VDF is a subclass of CLS (continuous local search) and Relaxed-Sink-of-Verifiable-Line is a complete problem for the class VDF.
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